Indiana Notice of Inability to Determine Liability / Request for Additional Time — SF 48557 is a form used by the state of Indiana when an individual or business needs more time to determine their tax liability. This form is typically used when a taxpayer’s records are incomplete or require additional review. The form provides information on the taxpayer’s current status, including the taxpayer’s name, address, and taxpayer identification number (TIN). The form includes two types of requests: a request for an extension of time to file a return and a request for additional time to determine the amount of tax due. The taxpayer must provide an explanation of why they are unable to determine their liability and must also provide evidence of their efforts to comply with the state’s tax laws. The form must be completed and signed by the taxpayer or their appointed representative. It must be sent to the Indiana Department of Revenue (FOR) within 30 days of the original due date. The FOR will review the request and may grant an extension of time to file or may require additional information before determining the taxpayer’s liability.